The README file says:
Installation assumes that you already have the game data installed somewhere on you hard drive.
You will need the original Freespace 2 data files to play this version. You may be able to find these files
elsewhere but that is not a topic that will be discussed here.
I do indeed have the original data files, but the thing is, Freespace 2 was a Windows game. Unsurprisingly, the installer does not run on the Mac. I can't copy the files from a Windows machine - I no longer allow any Microsoft crap in my house. So how am I supposed to get the data off the CDs and onto my hard drive? I have tried cabextract but it does not seem able to read these cab files. I tried unshield but it will not compile on the Mac. Saying "it will not be discussed" is hardly useful when this info is absolutely essential to run the game! In fact I would suggest that the README provide step by instructions rather than assuming we already know how to do it.